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    Ectopic Cushing syndrome

    Cushing syndrome - ectopic

    Ectopic Cushing syndrome is a condition in which a tumor outside the pituitary or adrenal glands produces a hormone called adrenocorticotropic hormone (ACTH).

    Causes

    Cushing syndrome is the result of too much glucocorticoid hormones being released over a long period of time. About 15% of Cushing syndrome cases are due to ectopic Cushing syndrome.

    Ectopic Cushing syndrome is caused by tumors that release adrenocorticotropic hormone (ACTH). Other causes of Cushing syndrome are:

    • Excess release of ACTH by the pituitary gland
    • Long-term use of corticosteroid drugs (commonly used to treat conditions such as rheumatoid arthritis and asthma)
    • Tumor of the adrenal gland

    Tumors that can, in rare cases, release ACTH include:

    • Islet cell tumors of the pancreas
    • Medullary carcinoma of the thyroid
    • Small cell tumors of the lung
    • Tumors of the thymus gland

    Symptoms

    Ectopic Cushing syndrome tends to have fewer symptoms than classic Cushing syndrome. Weight loss may occur due to cancer.

    Symptoms of Cushing syndrome are:

    • Abdomen sticks out; arms and legs are thin (central obesity)
    • Acne or minor skin infections
    • Buffalo hump
    • Headache
    • Impotence (in men)
    • Increased urination
    • Menstrual cycle stops (in women)
    • Mental changes
    • Purple stretch marks on the skin of the abdomen, thighs, and breasts
    • Round, red, and full face (moon face)
    • Tanning or darkening of the skin
    • Thirst
    • Weakness

    Exams and Tests

    Tests that may be done include:

    • 24-hour urine for cortisol and creatinine
    • Blood tests to check ACTH, cortisol, and potassium levels
    • Dexamethasone suppression test
    • Fasting glucose
    • MRI and CT scans to find tumors

    Treatment

    The best treatment for ectopic Cushing syndrome is surgery to remove the tumor. Surgery is usually possible when the tumor is noncancerous (benign).

    In some cases, the tumor is cancerous and spreads to other areas of the body before the health care provider can discover the problem with cortisol production. Surgery may not be possible in these cases, but the doctor may prescribe drugs to block cortisol production.

    Outlook (Prognosis)

    Surgery to remove the tumor may lead to full recovery, but there is a chance that the tumor will come back.

    Possible Complications

    The tumor may spread or return after surgery. High cortisol levels may continue.

    When to Contact a Medical Professional

    Call your health care provider if you develop symptoms of Cushing syndrome.

    Prevention

    Prompt treatment of tumors may reduce the risk in some cases. Many cases are not preventable.

    References

    Stewart PM, Krone NP. The adrenal cortex. In: Kronenberg HM, Melmed S, Polonsky KS, Larsen PR. Williams Textbook of Endocrinology. 12th ed. Philadelphia, PA: Saunders Elsevier; 2011:chap 15.

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          Tests for Ectopic Cushing syndrome

          Review Date: 12/11/2011

          Reviewed By: Nancy J. Rennert, MD, Chief of Endocrinology & Diabetes, Norwalk Hospital, Associate Clinical Professor of Medicine, Yale University School of Medicine, New Haven, CT. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

          The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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